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REGULATORY MATTERS, COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage Of Increase In ACL Adjusted In Capital Measures   25.00%
Commercial And Financial Standby Letters Of Credit [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Commitments $ 123.1  
Commitments To Extend Credit [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Commitments 2,100.0  
Commitments To Extend Credit [Member] | Credit Card [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Commitments 1,100.0  
Retained Earnings [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Cummulative Effect Of New Accounting Principle In Period Of Adoption Adjusted In Capital Measures $ 62.3  
Basel III [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Conservation Buffer 2.50%  
Basel III [Member] | Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Capital To Risk Weight Assets Ratio Capital Adequacy 4.50%  
Common Equity Tier1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 7.00%  
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets 6.0  
Total Tier 1 Capital To Risk Weight Assets Ratio Plus Common Equity Tier 1 Capital Conservation Buffer 8.50%  
Capital Required For Capital Adequacy To Risk Weighted Assets 8.0  
Capital Required For Capital Adequacy To Risk Weighted Assets Plus Common Equity Tier 1 Capital Conservation Buffer 10.50%  
Leverage Ratio Required Fo Capital Adequacy Ratio 4